Ext Apps— plugin

Ext Apps — independently scanned and version-tracked by SaferSkills.

by modelcontextprotocol·Plugin·github.com/modelcontextprotocol/ext-apps
2,469stars324forksReview on GitHub →

Is Ext Apps safe to install?

SaferSkills independently audited Ext Apps (Plugin) and scored it 45/100 (orange). The audit ran 55 deterministic rules across Security, Supply Chain, Maintenance, Transparency, and Community; it found 1 high-severity and 0 lower-severity findings. The full rule-by-rule trace and per-finding evidence are below. Free, methodology-open.

Score
45/100
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↑ +0 since first scan (45 → 45)Re-scan~30s
Latest scan
ScannedJun 22, 2026 · 30d ago
Scans run1 over 90 days
Detectors55 checks · 5 categories
Findings0 warnings · 1 high
EngineSaferSkills 755a9a5
View methodology →
SaferSkills installs
This week0
This month0
All time0
CategoryWeightCategory scoreContribution
Securityprompt, exec, net, exfil, eval
35%
75
26.3 pts
Supply chainhash, typosquat, maintainer, lockfile
20%
100
20.0 pts
Maintenancestaleness, pinning, CI
15%
100
15.0 pts
TransparencySKILL.md, perms, README
15%
100
15.0 pts
Communityinstalls, verify, response
15%
100
15.0 pts

Findings & checks · 1 flagged

Securityscore 75 · 1 finding
HIGHReads your SSH private keySS-PLUGIN-SECRET-EXFIL-SSH-01 · Credential exfiltration · examples/pdf-server/server.ts
HIGH — SSH keys are high-value but their blast radius depends on what they authorize, so this is high rather than critical.
Why it matters

This plugin references an SSH private-key path or a private-key file header (* can request `{imageUrl:"/Users/x/.ssh/id_rsa"}…). An SSH private key authenticates you to servers and Git remotes, so code that reads it can impersonate you wherever that key is trusted.

The exact value spotted
excerptexamples/pdf-server/server.ts· typescript
1835* SECURITY: imageUrl is model-controlled. It must pass the same
1836* validateUrl() gate as display_pdf/save_pdf — otherwise the model
1837* can request `{imageUrl:"/Users/x/.ssh/id_rsa"}`, we'd readFile it,
1838* base64 the bytes, ship them to the iframe, and get_screenshot (or
1839* any future echo path) reads them back. Throws on rejection so the
Occurrences
1 occurrence · at L1837
How to fix
Remove the code that reads the private key; delegate authentication to the SSH agent or the system git client.
  1. Delete any direct read of id_rsa / id_ed25519 or other key files.
  2. Authenticate through the SSH agent or `git` so the private key never enters plugin memory or an outbound request.
Avoidkey = open(os.path.expanduser("~/.ssh/id_rsa")).read() requests.post(url, data={"key": key})
Safer pattern# let the SSH agent / git handle auth; never read or send the key subprocess.run(["git", "fetch", remote], check=True)
Framework references
OWASPLLM02ATLASAML.T0025CWE-200
Trace & refs
ruleSS-PLUGIN-SECRET-EXFIL-SSH-01sha2566eca2c923ad05fff…rubric 365aacaView on GitHub
Supply chainscore 100 · 0 findings
✓—All supply chain checks passedNo findings in this category for the latest scan.pass
Maintenancescore 100 · 0 findings
✓—All maintenance checks passedNo findings in this category for the latest scan.pass
Transparencyscore 100 · 0 findings
✓—All transparency checks passedNo findings in this category for the latest scan.pass
Communityscore 100 · 0 findings
✓—All community checks passedNo findings in this category for the latest scan.pass
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